| Local Name | Redmi 9 Activ |
| Technology | GSM / HSPA / LTE |
| 4G Bands | 1, 3, 5, 8, 40, 41 |
| 3G Bands | HSDPA 850 / 900 / 2100 |
| 2G Bands | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| Speed | HSPA 42.2/5.76 Mbps, LTE-A |
| Announced | 2021, September 24 |
| Status | Available. Released 2021, September 24 |
| Dimensions | 164.9 x 77.1 x 9 mm (6.49 x 3.04 x 0.35 in) |
| Weight | 194 g (6.84 oz) |
| SIM | Dual SIM (Nano-SIM, dual stand-by) |
| Body | Water-repellent coating |
| Display Type | Li-Po 5000 mAh, non-removable |
| Screen Size | 6.53 inches, 102.9 cm2 (~81.0% screen-to-body ratio) |
| Resolution | 720 x 1600 pixels, 20:9 ratio (~269 ppi density) |
| OS | Android 10, MIUI 12 |
| Chipset | MediaTek MT6765G Helio G35 (12 nm) |
| CPU | Octa-core (4x2.3 GHz Cortex-A53 & 4x1.8 GHz Cortex-A53) |
| GPU | PowerVR GE8320 |
| Card Slot | microSDXC (dedicated slot) |
| Internal Memory | 64GB 4GB RAM, 128GB 6GB RAM | eMMC 5.1 |
| Camera Features | HDR |
| Video | 1080p@30fps |
| Loudspeaker | Yes |
| 3.5mm Jack | Yes |
| WLAN | Wi-Fi 802.11 b/g/n, Wi-Fi Direct, hotspot |
| Bluetooth | 5.0, A2DP, LE |
| GPS | Yes, with A-GPS, GLONASS, BDS |
| NFC | No |
| Radio | FM radio |
| USB | microUSB 2.0, USB On-The-Go |
| Sensors | Fingerprint (rear-mounted), accelerometer, proximity |
| Colors | Carbon Black, Coral Green, Metallic Purple |
